Hot pot for explosive engines and method of forming the same



Aug. 28, 1923,

F. SHEPHERD.

HOT PO T FOR EXPLOSIVE ENGINES AND METHOD OF FORMING THE SAME Filed Oct. 6, 1920 2 Sheets-Sheet 1 l. .1. I! I Aug. 28, 1923. 1,466.346

- H. F. SHEPHERD HOT POT FOR EXPIQOSIVE ENGINES AND METHOD OF FORMING. SAME Filed Oct. 6, 1920 2 Shea'Es-Shaet 2 HAROLD F. SHEPHERD, or GRovE our, P

MER GAS ENGINE COMPANY, OF GROVE CITY,,PENN SYI;VANIA, A'CORIQRATIONJ- or PENNSYLVANIA.

HOT ro'r rorv nxrnosivrs ENGINES Ann iunrzron orlr 'oitmrn enig a,

' Application filed October 6, 1920. Serial No. 415,203.

T all w/mmitmcy concern: 1

Be it knownthat I, IILAROLD F. SHEPHERD,

a citizen of the United States, residing at Grove City, in the county 'of Mercer and 5 State of Pennsylvania, have invented new p H 'bust on'chamberfof an'explosive-engine with and useful Improvements in-a Hot Pot for Explosive Engines and Methods of Forming' the Same, of which the following is a specification.

I have in Patent #1,258,156, issued to me Mar. 5, 1918, disclosed a hot plate apparatus which involves a hot pot in which there is arranged a liquid vaporizing at the desired temperature or the hot plate, the vapor of the liquid being condensed by a cold wall on the pot so as to dissipate the excess heat of the h'otplate and thus maintain the hot plate at a constant temperature. 7 V

I have found mercury to be a desirable liquid for this purpose because it has a vaporizing temperature which is desirable for most forms of oil. It is very important where this hot plateis used on explosive engines or devices which go intogeneral use to have its'o formed that it will be permanent in its character and it is also desirable to have the vapor readily condensed so that the liquid may not be wholly vaporized. and where the condensing takes place promptly a smaller amount of liquid may be used. 1 Further if the condensation is not adequate there is a difference in pressure through the formation of the vapor and this varies the vaporizing temperature. It has been found that the inclusion of air in the hot pot interferes very materially with the condensing of the vapors because this air being some what lighter than the vapors of mercury forms an insulating coating over the con (lensing surfaces. It is desirable, therefore, to excludethe air from the hot pot and so seal the hot pot as to prevent the escape of the mercury vapors or the ingress of. air.

In carrying out my method I place the desired quantity of mercury in the hot pot, heat it to a vaporizing temperature, allow the vapor to accumulate until the mercury vapors show-as escaping, and then seal the pot, the mercury vapors being slightly heavier than the air will first exclude the air so that the exhaustion of readily accomplished.

the air may ENNSYLVANIA, Assieuon To Ern e: BEssE v v The invention'is illustrated in the f ac companying drawings as follows Fig. IshowSa'central section ofthe coma hot pot in place. v

Fig. 2 shows a hot pot with a heating apparatus for vaporizing mercury to expel the air. 1 p

1 marks the combustion chamber of an explosive engine, 2 the fuel injector, 3 a hot plate forming the bottom of the hot pot 4:,

5 the cover of the hot pot, the cover form-r ingthe condensingsurface, and 6 a mercury bath arranged in the hot pot. The hot pot is formed with the flanges 8 which are secured within the walls of the engine above the combustion chamber by a plate 9' which forms a water jacket for cooling thecover or condensing surface 5, the jacket having the inlet 10 and outlet 11 for circulating-a the hot pot the cover is placed in the pot proper and the joint. is sealed by welding as indicated at F. the'bottom of the ,pot and the temperature raised to a point that will vaporize the mercuryy The mercury vapor being" heavier than air in rising expe-ls the air from the pot through the opening 7 in the cover. As soon as the air is completely expelled the mercury vapor begins to escape at the opening 7; thus indicating the complete expulsion of air at which moment the plug 7 is put in place, thus completely sealing the pot. The pot then, therefore, is free from air and consequently the condensingsurfaces can be directly reached by the vapor as it rises from the liquid mercury and the condensation is, therefore, prompt and so rapid as to prevent any building up of pressure in the pot in any ordinary use. This rapid condensation also permits of the use of but a small amount ofmercury in cover ing the hot plate. By forming the pot of a solid bottom portionfand a flange cover which is extended into this pot' a ready I means of forming a sealing connection between the cover and the pot is afforded.

cooling medium such as water. Informing V A torch 12 is applied to tion of a hot pot, one fall of whieh forms a hot plate, said pot having the air exrhausted therefromand sealed; and a liquid in the pot over the. plate vaporizing at a pre-determined temperature.

2. In a hot plate apparatus, the comhination of a hot pot, one Wall 0i which forms a hot plate, said pot having the air ex; hau'sted therefrom andsealed; a liquid in the pot over the plate vaporizing at a prerletermined temperature; and a condenser I for the vapor'fromthe liquid.

3. In a hot plate apparatus the j-eo1nbi- -0 nation'of a hot pot, one Wall of which forms V a hot plate, said pot having the air ex.

hausted therefrom and sealed; a liquid in the pot over the plate vaporizing at a predetermined temperature; and means for cooling the top of the pot.

at. In a hot plate apparatus, the combination of a hot-pot, one wall of which forms a hot plate, said pot having the air exhausted therefrom and sealed; and mercury in the pot over the plate vapori ing'at' a. predetermined temperature. 7

5. In a hot plate apparatusthe" eomhina tion of a hot pot, the bottomof \vhichforms a hot plate; a cover having a flange extend ing downwardly Within the Walls of the pot and forming a recess betweeirthe cover and the Wall of the pot; and a Welding metal filled inthe reeessand sealing the QOVBI' with the Walls of the pot. p

In testimony whereof Ihave hereunto set myhand. HAROLD F. SHEPHERD. 

